Web Services

If you’re ready to get down to the nitty gritty of OCLC web services, you’re in the right place. Find documentation for API URLs, content negotiation options, response formats and sample requests. Prefer to learn by doing? Try an API using our API Explorer.

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Add a WorldCat attribution to your site to help people connect WorldCat with libraries. Learn more »

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OCLC service area

OCLC service name

Web Services

The WorldCat Metadata API is a read-write service for WorldCat that makes it possible to add or update master bibliographic records in WorldCat, maintain holdings information, and work with local bibliographic data.